Reducing the number of road accidents is an urgent task, the solution of which can be achieved, including by improving the design of vehicles. One of the most common causes of road accidents is the occurrence of a car skidding during braking with its subsequent exit from the traffic corridor. The effective development of new vehicle safety systems that increase its directional stability during braking and the improvement of existing systems is possible only if there are reliable methods that take into account the main parameters of the vehicle that affect its stability during braking. The currently existing methods and expressions for calculating the heading angles of a car at the end of braking have a number of assumptions that facilitate the calculations. This does not diminish their value, but slightly reduces accuracy. The purpose of this work was to clarify the methodology for calculating the permissible and actual heading angles of the vehicle at the end of braking. Within the framework of the work, theoretical studies have been carried out, based on the analysis of existing research on this topic. Based on the analysis performed, it was found that the existing methods and expressions for calculating the heading angle of a car at the end of braking do not take into account the effect of differences in the track dimensions of the front and rear axles of the car, and the center of mass of the car is conventionally assumed to be located on the longitudinal axis of the car. Evaluation of the influence of these parameters on the accuracy of calculations has not been carried out at present, there are no expressions for calculating the permissible heading angle of the vehicle at the end of braking. As a result of theoretical studies, a refined technique was obtained, including expressions for calculating the actual heading angle of the vehicle at the end of braking under various braking modes. The previously specified parameters are taken into account in the expressions obtained. An equation was derived to calculate the permissible heading angle of the car at the end of braking, taking into account the dimensions of the car, its location relative to the edge of the carriageway and the width of the lane. The refined expressions and the resulting equation that form the methodology for calculating the heading angles of the vehicle at the end of braking represent the scientific novelty of this work. To increase the efficiency of calculations according to the proposed method, a computer program has been developed. The direction of further research is to assess the adequacy and accuracy of the proposed methodology using the developed program.

The purpose of the study is to improve the equipment for mixing dry crumbled feed with regard to the basic opera-tion condition or parameters. As a result of the issue analysis and the existing mixers structure, it was found that many machines used for the preparation of compound feeds are complex in the structure and not reliable in opera-tion, the feed mixture quality does not always meet the zootechnical requirements; the applied standard and exper-imental mixers of compound feeds because of imperfection of technological process and working parts contained, possess high specific power consumption. The construction of a universal low-speed batch mixer with a fixed rec-tangular case and combined two forcibly mixing working parts mounted horizontally is an advanced study direction for feed mixers improving. The study objectives incorporated the development of structural and technological speci-fication of a low-speed auger-blade mixer of batch action; the assessment of the impact of design parameters above mentioned of the mixer on its performance; to identify the rational structural and operating specification of the auger-blade mixer taking into consideration the cycle duration time. The research methodology provided the theo-retical justification of specification of the mixer taking into account the cycle duration period of the blending. Ex-pressions to determine the performance efficiency along the following stages were provided: involving auger con-veyor, the first and the second mixing transporting and throwing blades. Formulas are obtained for estimation the cycle period from the installation angle of the mixing-transporting blades and the rotation frequency of the working parts. Data obtained and given for estimation the cycle time from the installation angle of the mixing-transporting blades and the speed of the working parts allow to operate during the minimum cycle time, that is, to choose the op-timal angle of installation of the blades and the speed of rotation of the working parts.

The purpose of the study – is the equipment improvement for dry mixing of crumbled feed with substantiation of de-sign and operating parameters. The use of complete feed mixtures is possible only with the use of special techno-logical equipment – feed mixers, producing mixture homogeneity meeting livestock requirements. The costs of pur-chasing, operating and maintaining mixers ultimately affect the cost of livestock production. Accordingly, it is neces-sary to aim efforts at the reduction of these costs. This can be achieved by reducing the specific energy costs for the mixing process, which largely depend on the mixer design, its working parts operation and the efficiency of the mix-ing process and power consumption needed for mixing process. No method of power consumption estimation of mixers with combined working parts according to theoretical studies obtained, having alternating in regard to exe-cution and purpose areas. Power consumption needed for the mixing process is one of the main components of the operating costs for the mixing equipment, ultimately determining the specific energy costs for the mixing process – is one of the important specification of any mixer. The research methodology provided a theoretical basis for the relationship of the mixer parameters on the power consumption during mixing process. Equations for determining the power consumption for the parts were submitted in regard to auger conveyor, the first and the second transport-ing and throwing blades. The expression for determination of power consumption for mixing process from the an-gle of installation mixing and transporting blades, the filling ratio of the mixer and the frequency of rotation of the working parts have been received. The obtained and given expressions allow to determine the power values for the mixing process with an error of no more than 5%, with the values of the studied parameters of the mixer within the boundaries of the experiment.